Experts predict that 90 per cent of online content will be generated by AI by 2025. How can we identify whether content was human-generated, AI-generated, or some combination? The problem of AI-generated media and deepfakes is not only technical but also ethical and social. An AI for Good Global Summit workshop brought together technology and media companies, artists, international organizations, standards bodies, and academia, to discuss the security risks and challenges of deepfakes and generative artificial intelligence (AI), technological innovations, and areas where standards are needed.